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excited state: state in which an atom or molecule picks up outside energy, causing an electron to move into a higher-energy orbital.
Principal Quantum Level n = 1 is closest to the nucleus of the atom and of lowest energy. When the electron occupies the energy level of lowest energy the atom is said to be in its ground state. An atom can have only one ground state.If the electron occupies one of the higher energy levels then the atom is in an excited state. An atom has many excited states.ere's what happens... When a gaseous hydrogen atom in its ground state is excited by an input of energy, its electron is 'promoted' from the lowest energy level to one of higher energy. The atom does not remain excited but re-emits energy as electromagnetic radiation.